Robust Voice Activity Detection Algorithm Based on Feature of Frequency Modulation of Harmonics and Its DSP Implementation

Chung-Chien HSU  Kah-Meng CHEONG  Tai-Shih CHI  Yu TSAO  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E98-D   No.10   pp.1808-1817
Publication Date: 2015/10/01
Online ISSN: 1745-1361
Type of Manuscript: PAPER
Category: Speech and Hearing
Keyword: 
digital signal processor,  frequency modulation,  spectro-temporal analysis,  voice activity detection,  

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Summary: 
This paper proposes a voice activity detection (VAD) algorithm based on an energy related feature of the frequency modulation of harmonics. A multi-resolution spectro-temporal analysis framework, which was developed to extract texture features of the audio signal from its Fourier spectrogram, is used to extract frequency modulation features of the speech signal. The proposed algorithm labels the voice active segments of the speech signal by comparing the energy related feature of the frequency modulation of harmonics with a threshold. Then, the proposed VAD is implemented on one of Texas Instruments (TI) digital signal processor (DSP) platforms for real-time operation. Simulations conducted on the DSP platform demonstrate the proposed VAD performs significantly better than three standard VADs, ITU-T G.729B, ETSI AMR1 and AMR2, in non-stationary noise in terms of the receiver operating characteristic (ROC) curves and the recognition rates from a practical distributed speech recognition (DSR) system.